US Patent: 17,770
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| Bit or drill holder
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| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jul. 07, 1857 |
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Patent Pictures:
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1 | 2
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Kirk Eppler
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Description: |
| The bit tang has a square groove which engages with a matching projection in the jaws. A spring applies pressure to a movable face opposite the projection. When the bit is in place, a sliding collar locks it down. This early Amos Smith patent brace is very rare (Pearson "A" rating).Co-assignee George W. Otis was a blacksmith in Lynn. |
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